Commercial laboratory

Onterris Laboratories, LLC. – CA

El Dorado Hills, CA · El Dorado County

Homeowner samplesYou can collect and drop off your own sample
Mail-in kitsBottles shipped to you, sample shipped back
Walk-in drop offNot listed, call to confirm

Certification and services

State certified
Certification number
CA00413
Certified by
Colorado drinking water program
Certified for
Chemical
Lab type
Commercial
Last verified
September 29, 2026

Listed on the official state certified laboratory list.

Tests this lab is certified for

PFAS

How to submit a sample

  1. 1
    Call or check the website for the right bottles

    Bacteria samples need a sterile bottle from the lab. Chemistry samples usually take a clean container the lab supplies.

  2. 2
    Collect from a cold tap before treatment

    Skip softeners and filters. Remove the aerator, run the water 3 to 5 minutes, then fill without touching the inside of the cap.

  3. 3
    Keep it cold and deliver within 24 hours

    Bacteria samples are time-sensitive. Use a cooler with ice packs and hand it in or ship it the same day.

  4. 4
    Read the report against the standards

    Compare results with EPA drinking water limits. If anything is over, our problem pages explain what it means and how to treat it.

Certified by the Colorado Department of Public Health and Environment (certification CA00413). Listed by CDPHE as accepting outside samples. Certified analytes: Perfluorotetradecanoic acid, Perfluorotridecanoic acid, N-methyl perfluorooctanesulfonamidoacetic acid, N-ethyl perfluorooctanesulfonamidoacetic acid, Dioxin, Perfluoropentanesulfonic acid, Perfluoropentanoic acid, Perfluorododecanoic acid, Perfluoro-3-methoxypropanoic acid, Perfluoro-4-methoxybutanoic acid, Perfluoro(2-ethoxyethane)sulfonic acid, Perfluoroheptanesulfonic acid, 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid, Perfluorobutanoic acid, Nonafluoro-3,6-dioxaheptanoic acid, 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid, 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid, Perfluoroundecanoic acid, Perfluorooctanesulfonic acid, Perfluorooctanoic acid, Perfluorononanoic acid, Perfluorohexanesulfonic acid, Perfluorohexanoic acid, Perfluoroheptanoic acid, Perfluorodecanoic acid, Perfluorobutanesulfonic acid, Hexafluoropropylene oxide dimer acid, 4,8-Dioxa-3H-perfluorononanoic acid, 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid, 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid.

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